CRACK THE CODE · GRADE 5
The Obsidian Chest Codebreaker
Use your knowledge of redstone algebra to find the secret numerical value of each Minecraft block and unlock the ancient vault.
Each shape stands for a number. Work out the missing ones first, then solve the shape equations and read off the 4-digit code. Do it here or print the sheet — the answer key comes with it.
The key
Every symbol is a whole number from 1 to 20. A number in front of a shape means multiply: 2 stars = 2 x star.
Find the missing values
Some shapes in the key are missing. Use these equations to work them out, then write them into the key. Take them in order.
Crack these
- 1.(+)×=
- 2.3+2=CODE 1
- 3.××=
- 4.10−=CODE 2
- 5.×−=
- 6.××=CODE 3
- 7.×+×=
- 8.×(−)=CODE 4
- 9.3+2=
- 10.10−=
The vault code
Take the ones digit of your answers to problems 2, 4, 6, 8 (the ones tagged CODE 1–4), in that order. That opens the heavy obsidian chest.
Show answer key (for grown-ups)
Key: pentagon = 17 (hidden) · diamond = 4 · star = 19 · heart = 5 (hidden) · hexagon = 15 · triangle = 12 (hidden)
Every symbol is a whole number from 1 to 20.
Vault code: 9860